[0.115 lb] Yup, I keep losing in bizarre places for some reason.

I survived about a half year without a lens cap before caving and finally getting yet another one. 

This is an OEM lens cap from and for Fuji and fits the 16-55 perfectly, even over 77mm filters. Wish it were a little cheaper because buying these almost every year is a little annoying to the wallet, but people like me probably need a lens cap leash or something.

[77mm] I have a full set of the Xume magnetic filter rings and lens caps. One of the caps was lost and it was going to cost me $150 to replace it used since they don't make them anymore, shame. The Freewell caps work great and for much less. They are not a perfect fit, they move around just a little bit, but hey, it's a lens cap and the magnets grab and hold on. Great solution if you are in the same situation I was.

[77mm] Whether it be a Kase Wolverine neutral density filter, or Magnetic Lens Cap you want to fit, the process all starts with this little blighter.. Ingenious, allowing the original lens hoods to be fitted either way, my experience is limited to Nikon, Zeiss, Fuji, Sigma, Olympus and Hasselblad lenses. I am sure there will be one out there, but I haven't found it yet!

[Magnalium Alloy] Kade Wolverine filter is awesome. It is so light weight and have very strong magnets. It great to get the heavy weight from my 100mm filter system off my lens.

[77mm] Great extra cap, branded just like original (for Fujinon lens). Would buy again.

[77mm] I find these much more convenient than the plastic, spring loaded caps. they are a lot more expensive, but worth it in my estimation. I also use K&F concepts magnetic caps.

[0.115 lb] Trying URTH filter for the first time. Normally use B+W filters, but they are getting way too expensive. I like that URTH packaging is completely recyclable and they have a tree planting initiative when you purchase any of their products. Using the filter on a Nikon zoom 24-120mm lens. So far too good!

[Magnalium Alloy] Well built. The magnet is strong, and the ring is very thin.

[Magnalium Alloy] Works well. Clear optics. Love the magnetic connection. Easy to carry. Overall it’s exactly what I wanted.

[77mm] It's a small thin adapter ring that gives Kase magnetic filters something to stick to. A warning, though: be sure the filters are fully stuck before letting go. The magnetic attraction isn't all that strong unless the filters are fully seated in the adapter. The ring is thin enough that lens shades can still slide over it without problems. It's a nice, convenient system that makes filter usage easy and quick.